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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Incompatibility with lxml wheels on Python 3.13 – request for official compatibility matrix","articleBody":"Summary:\nWhen using `python-xmlsec` (v1.3.15+) with `lxml` (\u003e=5.4.0) in Python 3.13, the following runtime error occurs:\nRuntimeError: lxml \u0026 xmlsec libxml2 library version mismatch\n\nCause:\n- `lxml` wheels embed `libxml2`\n- `python-xmlsec` (via wheels or source) links against system-installed `libxml2`\n- Mismatch occurs if these differ\n\nRepro Steps:\npip install xmlsec==1.3.15\npip install lxml==5.4.0\nrun anything using both =\u003e runtime crash\n\nCould this repo:\n1. Document an official compatibility matrix (e.g. tested lxml + xmlsec + Python versions)?\n2. Mention the need to install lxml with --no-binary lxml if using the pip wheels for xmlsec?\n3. Offer optional linkage to system libxml2 via env var or flag?\n\nThis would help many consumers of python3-saml, pysaml2, and other XML signature flows.","author":{"url":"https://github.com/icarocd","@type":"Person","name":"icarocd"},"datePublished":"2025-05-06T20:31:20.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/352/python-xmlsec/issues/352"}